CVE Vulnerability

CVE-2022-36009

gomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. The power level parsing within gomatrixserverlib was failing to parse the `"events_default"` key of the `m.room.power_levels` event, defaulting the event default power level to zero in all cases. Power levels are the matrix terminology for user access level. In rooms where the `"events_default"` power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers. gomatrixserverlib contains a fix as of commit `723fd49` and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the `"events_default"` power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue.

8.8 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575 Patch Third Party Advisory
https://matrix.org/docs/guides/moderation/#power-levels Vendor Advisory
https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:matrix:dendrite:*:*:*:*:*:*:*:*
cpe:2.3:a:matrix:gomatrixserverlib:-:*:*:*:*:*:*:*
Information

Published : 2022-08-19 09:15

Updated : 2022-08-24 11:55

NVD link : CVE-2022-36009

Mitre link : CVE-2022-36009

Products Affected
No products.
CWE
CWE-863